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staging: android: ion: use dma_sync_sg_for_device to do flush

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Fake platform devices for ion page pools, which are required by dma api.

Change-Id: Id4b5844f20f993ea1b93704286610555386aeda8
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
This commit is contained in:
Jianqun Xu
2021-03-02 17:35:24 +08:00
committed by Tao Huang
parent 80e32bed61
commit d37c482e0e
3 changed files with 46 additions and 2 deletions
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19
drivers/staging/android/ion/ion.c
View File

@@ -481,6 +481,25 @@ static const struct dma_buf_ops dma_buf_ops = {
.vunmap = ion_dma_buf_vunmap,
};
void ion_page_sync_for_device(struct device *dev, struct page *page,
size_t size, enum dma_data_direction dir)
{
struct scatterlist sg;
if (!dev || !page)
return;
sg_init_table(&sg, 1);
sg_set_page(&sg, page, size, 0);
/*
* This is not correct - sg_dma_address needs a dma_addr_t that is valid
* for the targeted device, but this works on the currently targeted
* hardware.
*/
sg_dma_address(&sg) = page_to_phys(page);
dma_sync_sg_for_device(dev, &sg, 1, dir);
}
int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags)
{
struct ion_device *dev = internal_dev;

5
drivers/staging/android/ion/ion.h
View File

@@ -294,6 +294,7 @@ size_t ion_heap_freelist_size(struct ion_heap *heap);
* @gfp_mask: gfp_mask to use from alloc
* @order: order of pages in the pool
* @list: plist node for list of pools
* @dev: device for the pool
*
* Allows you to keep a pool of pre allocated pages to use from your heap.
* Keeping a pool of pages that is ready for dma, ie any cached mapping have
@@ -309,6 +310,7 @@ struct ion_page_pool {
gfp_t gfp_mask;
unsigned int order;
struct plist_node list;
struct device *dev;
};
struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
@@ -322,6 +324,9 @@ long ion_page_pool_nr_pages(void);
static inline long ion_page_pool_nr_pages(void) { return 0; }
#endif
void ion_page_sync_for_device(struct device *dev, struct page *page,
size_t size, enum dma_data_direction dir);
/** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
* @pool: the pool
* @gfp_mask: the memory type to reclaim

24
drivers/staging/android/ion/ion_page_pool.c
View File

@@ -5,6 +5,7 @@
* Copyright (C) 2011 Google, Inc.
*/
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/swap.h>
@@ -83,8 +84,12 @@ struct page *ion_page_pool_alloc(struct ion_page_pool *pool)
page = ion_page_pool_remove(pool, false);
mutex_unlock(&pool->mutex);
if (!page)
if (!page) {
page = ion_page_pool_alloc_pages(pool);
ion_page_sync_for_device(pool->dev, page,
PAGE_SIZE << pool->order,
DMA_BIDIRECTIONAL);
}
return page;
}
@@ -150,7 +155,8 @@ int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
{
struct ion_page_pool *pool = kmalloc(sizeof(*pool), GFP_KERNEL);
struct platform_device *pdev;
struct ion_page_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return NULL;
@@ -163,10 +169,24 @@ struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
mutex_init(&pool->mutex);
plist_node_init(&pool->list, order);
pdev = platform_device_alloc("ion_pool", PLATFORM_DEVID_AUTO);
if (pdev) {
if (!platform_device_add(pdev)) {
pool->dev = &pdev->dev;
goto exit;
}
platform_device_put(pdev);
}
exit:
return pool;
}
void ion_page_pool_destroy(struct ion_page_pool *pool)
{
struct platform_device *pdev;
pdev = pool->dev ? to_platform_device(pool->dev) : NULL;
platform_device_put(pdev);
kfree(pool);
}